[mirror_ubuntu-jammy-kernel.git] / arch / arm / plat-omap / mailbox.c

/*
 * OMAP mailbox driver
 *
 * Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
 *
 * Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA
 *
 */

#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/slab.h>

#include <plat/mailbox.h>

static struct workqueue_struct *mboxd;
static struct omap_mbox *mboxes;
static DEFINE_SPINLOCK(mboxes_lock);
static bool rq_full;

static int mbox_configured;
static DEFINE_MUTEX(mbox_configured_lock);

/* Mailbox FIFO handle functions */
static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
{
	return mbox->ops->fifo_read(mbox);
}
static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
{
	mbox->ops->fifo_write(mbox, msg);
}
static inline int mbox_fifo_empty(struct omap_mbox *mbox)
{
	return mbox->ops->fifo_empty(mbox);
}
static inline int mbox_fifo_full(struct omap_mbox *mbox)
{
	return mbox->ops->fifo_full(mbox);
}

/* Mailbox IRQ handle functions */
static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
	if (mbox->ops->ack_irq)
		mbox->ops->ack_irq(mbox, irq);
}
static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
{
	return mbox->ops->is_irq(mbox, irq);
}

/*
 * message sender
 */
static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{
	int ret = 0, i = 1000;

	while (mbox_fifo_full(mbox)) {
		if (mbox->ops->type == OMAP_MBOX_TYPE2)
			return -1;
		if (--i == 0)
			return -1;
		udelay(1);
	}
	mbox_fifo_write(mbox, msg);
	return ret;
}


int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
{

	struct request *rq;
	struct request_queue *q = mbox->txq->queue;

	rq = blk_get_request(q, WRITE, GFP_ATOMIC);
	if (unlikely(!rq))
		return -ENOMEM;

	blk_insert_request(q, rq, 0, (void *) msg);
	tasklet_schedule(&mbox->txq->tasklet);

	return 0;
}
EXPORT_SYMBOL(omap_mbox_msg_send);

static void mbox_tx_tasklet(unsigned long tx_data)
{
	int ret;
	struct request *rq;
	struct omap_mbox *mbox = (struct omap_mbox *)tx_data;
	struct request_queue *q = mbox->txq->queue;

	while (1) {

		rq = blk_fetch_request(q);

		if (!rq)
			break;

		ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
		if (ret) {
			omap_mbox_enable_irq(mbox, IRQ_TX);
			blk_requeue_request(q, rq);
			return;
		}
		blk_end_request_all(rq, 0);
	}
}

/*
 * Message receiver(workqueue)
 */
static void mbox_rx_work(struct work_struct *work)
{
	struct omap_mbox_queue *mq =
			container_of(work, struct omap_mbox_queue, work);
	struct omap_mbox *mbox = mq->queue->queuedata;
	struct request_queue *q = mbox->rxq->queue;
	struct request *rq;
	mbox_msg_t msg;
	unsigned long flags;

	while (1) {
		spin_lock_irqsave(q->queue_lock, flags);
		rq = blk_fetch_request(q);
		if (rq_full) {
			omap_mbox_enable_irq(mbox, IRQ_RX);
			rq_full = false;
		}
		spin_unlock_irqrestore(q->queue_lock, flags);
		if (!rq)
			break;

		msg = (mbox_msg_t)rq->special;
		blk_end_request_all(rq, 0);
		if (mbox->rxq->callback)
			mbox->rxq->callback((void *)msg);
	}
}

/*
 * Mailbox interrupt handler
 */
static void mbox_txq_fn(struct request_queue *q)
{
}

static void mbox_rxq_fn(struct request_queue *q)
{
}

static void __mbox_tx_interrupt(struct omap_mbox *mbox)
{
	omap_mbox_disable_irq(mbox, IRQ_TX);
	ack_mbox_irq(mbox, IRQ_TX);
	tasklet_schedule(&mbox->txq->tasklet);
}

static void __mbox_rx_interrupt(struct omap_mbox *mbox)
{
	struct request *rq;
	mbox_msg_t msg;
	struct request_queue *q = mbox->rxq->queue;

	while (!mbox_fifo_empty(mbox)) {
		rq = blk_get_request(q, WRITE, GFP_ATOMIC);
		if (unlikely(!rq)) {
			omap_mbox_disable_irq(mbox, IRQ_RX);
			rq_full = true;
			goto nomem;
		}

		msg = mbox_fifo_read(mbox);


		blk_insert_request(q, rq, 0, (void *)msg);
		if (mbox->ops->type == OMAP_MBOX_TYPE1)
			break;
	}

	/* no more messages in the fifo. clear IRQ source. */
	ack_mbox_irq(mbox, IRQ_RX);
nomem:
	queue_work(mboxd, &mbox->rxq->work);
}

static irqreturn_t mbox_interrupt(int irq, void *p)
{
	struct omap_mbox *mbox = p;

	if (is_mbox_irq(mbox, IRQ_TX))
		__mbox_tx_interrupt(mbox);

	if (is_mbox_irq(mbox, IRQ_RX))
		__mbox_rx_interrupt(mbox);

	return IRQ_HANDLED;
}

static struct omap_mbox_queue *mbox_queue_alloc(struct omap_mbox *mbox,
					request_fn_proc *proc,
					void (*work) (struct work_struct *),
					void (*tasklet)(unsigned long))
{
	struct request_queue *q;
	struct omap_mbox_queue *mq;

	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
	if (!mq)
		return NULL;

	spin_lock_init(&mq->lock);

	q = blk_init_queue(proc, &mq->lock);
	if (!q)
		goto error;
	q->queuedata = mbox;
	mq->queue = q;

	if (work)
		INIT_WORK(&mq->work, work);

	if (tasklet)
		tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
	return mq;
error:
	kfree(mq);
	return NULL;
}

static void mbox_queue_free(struct omap_mbox_queue *q)
{
	blk_cleanup_queue(q->queue);
	kfree(q);
}

static int omap_mbox_startup(struct omap_mbox *mbox)
{
	int ret = 0;
	struct omap_mbox_queue *mq;

	if (mbox->ops->startup) {
		mutex_lock(&mbox_configured_lock);
		if (!mbox_configured)
			ret = mbox->ops->startup(mbox);

		if (ret) {
			mutex_unlock(&mbox_configured_lock);
			return ret;
		}
		mbox_configured++;
		mutex_unlock(&mbox_configured_lock);
	}

	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
				mbox->name, mbox);
	if (ret) {
		printk(KERN_ERR
			"failed to register mailbox interrupt:%d\n", ret);
		goto fail_request_irq;
	}

	mq = mbox_queue_alloc(mbox, mbox_txq_fn, NULL, mbox_tx_tasklet);
	if (!mq) {
		ret = -ENOMEM;
		goto fail_alloc_txq;
	}
	mbox->txq = mq;

	mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work, NULL);
	if (!mq) {
		ret = -ENOMEM;
		goto fail_alloc_rxq;
	}
	mbox->rxq = mq;

	return 0;

 fail_alloc_rxq:
	mbox_queue_free(mbox->txq);
 fail_alloc_txq:
	free_irq(mbox->irq, mbox);
 fail_request_irq:
	if (mbox->ops->shutdown)
		mbox->ops->shutdown(mbox);

	return ret;
}

static void omap_mbox_fini(struct omap_mbox *mbox)
{
	free_irq(mbox->irq, mbox);
	tasklet_kill(&mbox->txq->tasklet);
	flush_work(&mbox->rxq->work);
	mbox_queue_free(mbox->txq);
	mbox_queue_free(mbox->rxq);

	if (mbox->ops->shutdown) {
		mutex_lock(&mbox_configured_lock);
		if (mbox_configured > 0)
			mbox_configured--;
		if (!mbox_configured)
			mbox->ops->shutdown(mbox);
		mutex_unlock(&mbox_configured_lock);
	}
}

static struct omap_mbox **find_mboxes(const char *name)
{
	struct omap_mbox **p;

	for (p = &mboxes; *p; p = &(*p)->next) {
		if (strcmp((*p)->name, name) == 0)
			break;
	}

	return p;
}

struct omap_mbox *omap_mbox_get(const char *name)
{
	struct omap_mbox *mbox;
	int ret;

	spin_lock(&mboxes_lock);
	mbox = *(find_mboxes(name));
	if (mbox == NULL) {
		spin_unlock(&mboxes_lock);
		return ERR_PTR(-ENOENT);
	}

	spin_unlock(&mboxes_lock);

	ret = omap_mbox_startup(mbox);
	if (ret)
		return ERR_PTR(-ENODEV);

	return mbox;
}
EXPORT_SYMBOL(omap_mbox_get);

void omap_mbox_put(struct omap_mbox *mbox)
{
	omap_mbox_fini(mbox);
}
EXPORT_SYMBOL(omap_mbox_put);

int omap_mbox_register(struct device *parent, struct omap_mbox *mbox)
{
	int ret = 0;
	struct omap_mbox **tmp;

	if (!mbox)
		return -EINVAL;
	if (mbox->next)
		return -EBUSY;

	spin_lock(&mboxes_lock);
	tmp = find_mboxes(mbox->name);
	if (*tmp) {
		ret = -EBUSY;
		spin_unlock(&mboxes_lock);
		goto err_find;
	}
	*tmp = mbox;
	spin_unlock(&mboxes_lock);

	return 0;

err_find:
	return ret;
}
EXPORT_SYMBOL(omap_mbox_register);

int omap_mbox_unregister(struct omap_mbox *mbox)
{
	struct omap_mbox **tmp;

	spin_lock(&mboxes_lock);
	tmp = &mboxes;
	while (*tmp) {
		if (mbox == *tmp) {
			*tmp = mbox->next;
			mbox->next = NULL;
			spin_unlock(&mboxes_lock);
			return 0;
		}
		tmp = &(*tmp)->next;
	}
	spin_unlock(&mboxes_lock);

	return -EINVAL;
}
EXPORT_SYMBOL(omap_mbox_unregister);

static int __init omap_mbox_init(void)
{
	mboxd = create_workqueue("mboxd");
	if (!mboxd)
		return -ENOMEM;

	return 0;
}
module_init(omap_mbox_init);

static void __exit omap_mbox_exit(void)
{
	destroy_workqueue(mboxd);
}
module_exit(omap_mbox_exit);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
MODULE_AUTHOR("Toshihiro Kobayashi");
MODULE_AUTHOR("Hiroshi DOYU");
Commit	Line	Data
340a614a HD	1	/*
	2	* OMAP mailbox driver
	3	*
f48cca87	4	* Copyright (C) 2006-2009 Nokia Corporation. All rights reserved.
340a614a	5	*
f48cca87	6	* Contact: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
340a614a HD	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* version 2 as published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	20	* 02110-1301 USA
	21	*
	22	*/
	23
340a614a	24	#include <linux/module.h>
340a614a HD	25	#include <linux/interrupt.h>
340a614a HD	26	#include <linux/device.h>
340a614a	27	#include <linux/delay.h>
5a0e3ad6	28	#include <linux/slab.h>
8dff0fa5	29
ce491cf8	30	#include <plat/mailbox.h>
340a614a	31
8250a5c3	32	static struct workqueue_struct *mboxd;
340a614a	33	static struct omap_mbox *mboxes;
10d1a002	34	static DEFINE_SPINLOCK(mboxes_lock);
1ea5d6d1	35	static bool rq_full;
340a614a	36
5f00ec64	37	static int mbox_configured;
72b917ef	38	static DEFINE_MUTEX(mbox_configured_lock);
5f00ec64	39
9ae0ee00 HD	40	/* Mailbox FIFO handle functions */
	41	static inline mbox_msg_t mbox_fifo_read(struct omap_mbox *mbox)
	42	{
	43	return mbox->ops->fifo_read(mbox);
	44	}
	45	static inline void mbox_fifo_write(struct omap_mbox *mbox, mbox_msg_t msg)
	46	{
	47	mbox->ops->fifo_write(mbox, msg);
	48	}
	49	static inline int mbox_fifo_empty(struct omap_mbox *mbox)
	50	{
	51	return mbox->ops->fifo_empty(mbox);
	52	}
	53	static inline int mbox_fifo_full(struct omap_mbox *mbox)
	54	{
	55	return mbox->ops->fifo_full(mbox);
	56	}
	57
	58	/* Mailbox IRQ handle functions */
9ae0ee00 HD	59	static inline void ack_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	60	{
	61	if (mbox->ops->ack_irq)
	62	mbox->ops->ack_irq(mbox, irq);
	63	}
	64	static inline int is_mbox_irq(struct omap_mbox *mbox, omap_mbox_irq_t irq)
	65	{
	66	return mbox->ops->is_irq(mbox, irq);
	67	}
	68
340a614a HD	69	/*
	70	* message sender
	71	*/
c7c158e5	72	static int __mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
340a614a HD	73	{
	74	int ret = 0, i = 1000;
	75
	76	while (mbox_fifo_full(mbox)) {
	77	if (mbox->ops->type == OMAP_MBOX_TYPE2)
	78	return -1;
	79	if (--i == 0)
	80	return -1;
	81	udelay(1);
	82	}
340a614a	83	mbox_fifo_write(mbox, msg);
340a614a HD	84	return ret;
	85	}
	86
ec24751a	87
b2b6362e	88	int omap_mbox_msg_send(struct omap_mbox *mbox, mbox_msg_t msg)
340a614a	89	{
5ed8d32e	90
340a614a HD	91	struct request *rq;
340a614a HD	92	struct request_queue *q = mbox->txq->queue;
ec24751a	93
340a614a	94	rq = blk_get_request(q, WRITE, GFP_ATOMIC);
5ed8d32e	95	if (unlikely(!rq))
ec24751a	96	return -ENOMEM;
340a614a	97
5ed8d32e S	98	blk_insert_request(q, rq, 0, (void *) msg);
5ed8d32e S	99	tasklet_schedule(&mbox->txq->tasklet);
340a614a	100
ec24751a	101	return 0;
340a614a HD	102	}
	103	EXPORT_SYMBOL(omap_mbox_msg_send);
	104
5ed8d32e	105	static void mbox_tx_tasklet(unsigned long tx_data)
340a614a HD	106	{
	107	int ret;
	108	struct request *rq;
5ed8d32e	109	struct omap_mbox mbox = (struct omap_mbox )tx_data;
340a614a HD	110	struct request_queue *q = mbox->txq->queue;
	111
	112	while (1) {
ec24751a	113
9934c8c0	114	rq = blk_fetch_request(q);
340a614a HD	115
	116	if (!rq)
	117	break;
	118
5ed8d32e	119	ret = __mbox_msg_send(mbox, (mbox_msg_t)rq->special);
340a614a	120	if (ret) {
eb18858e	121	omap_mbox_enable_irq(mbox, IRQ_TX);
296b2f6a	122	blk_requeue_request(q, rq);
340a614a HD	123	return;
340a614a HD	124	}
5ed8d32e	125	blk_end_request_all(rq, 0);
340a614a HD	126	}
	127	}
	128
	129	/*
	130	* Message receiver(workqueue)
	131	*/
	132	static void mbox_rx_work(struct work_struct *work)
	133	{
	134	struct omap_mbox_queue *mq =
	135	container_of(work, struct omap_mbox_queue, work);
	136	struct omap_mbox *mbox = mq->queue->queuedata;
	137	struct request_queue *q = mbox->rxq->queue;
	138	struct request *rq;
	139	mbox_msg_t msg;
	140	unsigned long flags;
	141
340a614a HD	142	while (1) {
340a614a HD	143	spin_lock_irqsave(q->queue_lock, flags);
9934c8c0	144	rq = blk_fetch_request(q);
1ea5d6d1 FGL	145	if (rq_full) {
	146	omap_mbox_enable_irq(mbox, IRQ_RX);
	147	rq_full = false;
	148	}
340a614a HD	149	spin_unlock_irqrestore(q->queue_lock, flags);
	150	if (!rq)
	151	break;
	152
ec24751a	153	msg = (mbox_msg_t)rq->special;
40cbbb78	154	blk_end_request_all(rq, 0);
9caae4d8 FGL	155	if (mbox->rxq->callback)
9caae4d8 FGL	156	mbox->rxq->callback((void *)msg);
340a614a HD	157	}
	158	}
	159
	160	/*
	161	* Mailbox interrupt handler
	162	*/
bfe1f6ac	163	static void mbox_txq_fn(struct request_queue *q)
340a614a HD	164	{
	165	}
	166
bfe1f6ac	167	static void mbox_rxq_fn(struct request_queue *q)
340a614a HD	168	{
	169	}
	170
	171	static void __mbox_tx_interrupt(struct omap_mbox *mbox)
	172	{
eb18858e	173	omap_mbox_disable_irq(mbox, IRQ_TX);
340a614a	174	ack_mbox_irq(mbox, IRQ_TX);
5ed8d32e	175	tasklet_schedule(&mbox->txq->tasklet);
340a614a HD	176	}
	177
	178	static void __mbox_rx_interrupt(struct omap_mbox *mbox)
	179	{
	180	struct request *rq;
	181	mbox_msg_t msg;
165125e1	182	struct request_queue *q = mbox->rxq->queue;
340a614a	183
340a614a HD	184	while (!mbox_fifo_empty(mbox)) {
340a614a HD	185	rq = blk_get_request(q, WRITE, GFP_ATOMIC);
1ea5d6d1 FGL	186	if (unlikely(!rq)) {
	187	omap_mbox_disable_irq(mbox, IRQ_RX);
	188	rq_full = true;
340a614a	189	goto nomem;
1ea5d6d1	190	}
340a614a HD	191
340a614a HD	192	msg = mbox_fifo_read(mbox);
340a614a	193
340a614a	194
ec24751a	195	blk_insert_request(q, rq, 0, (void *)msg);
340a614a HD	196	if (mbox->ops->type == OMAP_MBOX_TYPE1)
	197	break;
	198	}
	199
	200	/* no more messages in the fifo. clear IRQ source. */
	201	ack_mbox_irq(mbox, IRQ_RX);
f48cca87	202	nomem:
8250a5c3	203	queue_work(mboxd, &mbox->rxq->work);
340a614a HD	204	}
	205
	206	static irqreturn_t mbox_interrupt(int irq, void *p)
	207	{
2a7057e3	208	struct omap_mbox *mbox = p;
340a614a HD	209
	210	if (is_mbox_irq(mbox, IRQ_TX))
	211	__mbox_tx_interrupt(mbox);
	212
	213	if (is_mbox_irq(mbox, IRQ_RX))
	214	__mbox_rx_interrupt(mbox);
	215
	216	return IRQ_HANDLED;
	217	}
	218
340a614a	219	static struct omap_mbox_queue mbox_queue_alloc(struct omap_mbox mbox,
bfe1f6ac	220	request_fn_proc *proc,
5ed8d32e S	221	void (work) (struct work_struct ),
5ed8d32e S	222	void (*tasklet)(unsigned long))
340a614a	223	{
165125e1	224	struct request_queue *q;
340a614a HD	225	struct omap_mbox_queue *mq;
	226
	227	mq = kzalloc(sizeof(struct omap_mbox_queue), GFP_KERNEL);
	228	if (!mq)
	229	return NULL;
	230
	231	spin_lock_init(&mq->lock);
	232
	233	q = blk_init_queue(proc, &mq->lock);
	234	if (!q)
	235	goto error;
	236	q->queuedata = mbox;
	237	mq->queue = q;
	238
5ed8d32e S	239	if (work)
5ed8d32e S	240	INIT_WORK(&mq->work, work);
340a614a	241
5ed8d32e S	242	if (tasklet)
5ed8d32e S	243	tasklet_init(&mq->tasklet, tasklet, (unsigned long)mbox);
340a614a HD	244	return mq;
	245	error:
	246	kfree(mq);
	247	return NULL;
	248	}
	249
	250	static void mbox_queue_free(struct omap_mbox_queue *q)
	251	{
	252	blk_cleanup_queue(q->queue);
	253	kfree(q);
	254	}
	255
c7c158e5	256	static int omap_mbox_startup(struct omap_mbox *mbox)
340a614a	257	{
5f00ec64	258	int ret = 0;
340a614a HD	259	struct omap_mbox_queue *mq;
340a614a HD	260
01072d8f	261	if (mbox->ops->startup) {
72b917ef	262	mutex_lock(&mbox_configured_lock);
5f00ec64 S	263	if (!mbox_configured)
	264	ret = mbox->ops->startup(mbox);
	265
01072d8f	266	if (ret) {
72b917ef	267	mutex_unlock(&mbox_configured_lock);
340a614a	268	return ret;
5f00ec64 S	269	}
5f00ec64 S	270	mbox_configured++;
72b917ef	271	mutex_unlock(&mbox_configured_lock);
340a614a HD	272	}
340a614a HD	273
5e683825	274	ret = request_irq(mbox->irq, mbox_interrupt, IRQF_SHARED,
340a614a	275	mbox->name, mbox);
01072d8f	276	if (ret) {
340a614a HD	277	printk(KERN_ERR
	278	"failed to register mailbox interrupt:%d\n", ret);
	279	goto fail_request_irq;
	280	}
340a614a	281
5ed8d32e	282	mq = mbox_queue_alloc(mbox, mbox_txq_fn, NULL, mbox_tx_tasklet);
340a614a HD	283	if (!mq) {
	284	ret = -ENOMEM;
	285	goto fail_alloc_txq;
	286	}
	287	mbox->txq = mq;
	288
5ed8d32e	289	mq = mbox_queue_alloc(mbox, mbox_rxq_fn, mbox_rx_work, NULL);
340a614a HD	290	if (!mq) {
	291	ret = -ENOMEM;
	292	goto fail_alloc_rxq;
	293	}
	294	mbox->rxq = mq;
	295
	296	return 0;
	297
	298	fail_alloc_rxq:
	299	mbox_queue_free(mbox->txq);
	300	fail_alloc_txq:
	301	free_irq(mbox->irq, mbox);
	302	fail_request_irq:
01072d8f	303	if (mbox->ops->shutdown)
340a614a HD	304	mbox->ops->shutdown(mbox);
	305
	306	return ret;
	307	}
	308
	309	static void omap_mbox_fini(struct omap_mbox *mbox)
	310	{
ad6d9627	311	free_irq(mbox->irq, mbox);
0e828e8c FGL	312	tasklet_kill(&mbox->txq->tasklet);
0e828e8c FGL	313	flush_work(&mbox->rxq->work);
340a614a HD	314	mbox_queue_free(mbox->txq);
	315	mbox_queue_free(mbox->rxq);
	316
01072d8f	317	if (mbox->ops->shutdown) {
72b917ef	318	mutex_lock(&mbox_configured_lock);
5f00ec64 S	319	if (mbox_configured > 0)
	320	mbox_configured--;
	321	if (!mbox_configured)
	322	mbox->ops->shutdown(mbox);
72b917ef	323	mutex_unlock(&mbox_configured_lock);
5f00ec64	324	}
340a614a HD	325	}
	326
	327	static struct omap_mbox *find_mboxes(const char name)
	328	{
	329	struct omap_mbox **p;
	330
	331	for (p = &mboxes; p; p = &(p)->next) {
	332	if (strcmp((*p)->name, name) == 0)
	333	break;
	334	}
	335
	336	return p;
	337	}
	338
	339	struct omap_mbox omap_mbox_get(const char name)
	340	{
	341	struct omap_mbox *mbox;
	342	int ret;
	343
10d1a002	344	spin_lock(&mboxes_lock);
340a614a HD	345	mbox = *(find_mboxes(name));
340a614a HD	346	if (mbox == NULL) {
10d1a002	347	spin_unlock(&mboxes_lock);
340a614a HD	348	return ERR_PTR(-ENOENT);
	349	}
	350
10d1a002	351	spin_unlock(&mboxes_lock);
340a614a	352
c7c158e5	353	ret = omap_mbox_startup(mbox);
340a614a HD	354	if (ret)
	355	return ERR_PTR(-ENODEV);
	356
	357	return mbox;
	358	}
	359	EXPORT_SYMBOL(omap_mbox_get);
	360
	361	void omap_mbox_put(struct omap_mbox *mbox)
	362	{
	363	omap_mbox_fini(mbox);
	364	}
	365	EXPORT_SYMBOL(omap_mbox_put);
	366
f48cca87	367	int omap_mbox_register(struct device parent, struct omap_mbox mbox)
340a614a HD	368	{
	369	int ret = 0;
	370	struct omap_mbox **tmp;
	371
	372	if (!mbox)
	373	return -EINVAL;
	374	if (mbox->next)
	375	return -EBUSY;
	376
10d1a002	377	spin_lock(&mboxes_lock);
340a614a	378	tmp = find_mboxes(mbox->name);
f48cca87	379	if (*tmp) {
340a614a	380	ret = -EBUSY;
10d1a002	381	spin_unlock(&mboxes_lock);
f48cca87 HD	382	goto err_find;
	383	}
	384	*tmp = mbox;
10d1a002	385	spin_unlock(&mboxes_lock);
340a614a	386
f48cca87 HD	387	return 0;
	388
	389	err_find:
340a614a HD	390	return ret;
	391	}
	392	EXPORT_SYMBOL(omap_mbox_register);
	393
	394	int omap_mbox_unregister(struct omap_mbox *mbox)
	395	{
	396	struct omap_mbox **tmp;
	397
10d1a002	398	spin_lock(&mboxes_lock);
340a614a HD	399	tmp = &mboxes;
	400	while (*tmp) {
	401	if (mbox == *tmp) {
	402	*tmp = mbox->next;
	403	mbox->next = NULL;
10d1a002	404	spin_unlock(&mboxes_lock);
340a614a HD	405	return 0;
	406	}
	407	tmp = &(*tmp)->next;
	408	}
10d1a002	409	spin_unlock(&mboxes_lock);
340a614a HD	410
	411	return -EINVAL;
	412	}
	413	EXPORT_SYMBOL(omap_mbox_unregister);
	414
c7c158e5	415	static int __init omap_mbox_init(void)
340a614a	416	{
8250a5c3 RC	417	mboxd = create_workqueue("mboxd");
	418	if (!mboxd)
	419	return -ENOMEM;
	420
c7c158e5	421	return 0;
340a614a	422	}
c7c158e5	423	module_init(omap_mbox_init);
340a614a	424
c7c158e5	425	static void __exit omap_mbox_exit(void)
340a614a	426	{
8250a5c3	427	destroy_workqueue(mboxd);
340a614a	428	}
c7c158e5	429	module_exit(omap_mbox_exit);
340a614a	430
f48cca87 HD	431	MODULE_LICENSE("GPL v2");
f48cca87 HD	432	MODULE_DESCRIPTION("omap mailbox: interrupt driven messaging");
f375325a OBC	433	MODULE_AUTHOR("Toshihiro Kobayashi");
f375325a OBC	434	MODULE_AUTHOR("Hiroshi DOYU");